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AR# 57148

MIG 7 Series QDRII+ - Latch inference on init_rd_cmd_d_reg[0]


Version Found: v2.0
Version Resolved: See (Xilinx Answer 54025)

All MIG QDRII+ 7 Series v2.0 designs infer a latch for signal init_rd_cmd_d_reg[0] inside phy_write_init_sm.v.


This should not affect hardware results as the timing for this path should have sufficient margin. However, the attached latch_timing_force_check.tcl script can be run on your design to check if timing is an issue. If so, the attached patch (AR57148.zip) can be applied to resolve the latch inference.

NOTE: Instructions for applying the patch for Vivado can be found in the readme.txt file which are located in the patch ZIP.

Revision History
08/16/2013 - Initial release


Associated Attachments

Name File Size File Type
latch_timing_force_check.tcl 333 Bytes TCL
AR57148.zip 17 KB ZIP

Linked Answer Records

Master Answer Records

Answer Number Answer Title Version Found Version Resolved
54025 MIG 7 Series - IP Release Notes and Known Issues for Vivado 2013.1 and newer tool versions N/A N/A
AR# 57148
Date Created 08/16/2013
Last Updated 09/26/2013
Status Active
Type Known Issues
  • Virtex-7
  • Kintex-7
  • MIG 7 Series